Auxiliary positioning device for shoulder joint image scanning

Abstract

The invention provides an auxiliary positioning device for shoulder joint image scanning, and relates to the technical field of image scanning. Comprising a shoulder shell and an arm shell, the shoulder shell and the arm shell are connected through an angle locking assembly, the shoulder shell and the arm shell can relatively rotate or be locked, a bandage is installed on the shoulder shell and the arm shell, a bandage driving device is installed on the shoulder shell and the arm shell, and the bandage driving device drives the bandage to be folded or unfolded. The angle locking assembly achieves angle adjustment and locking of the fixed shoulder shell and the arm shell, the bandage driving device achieves rapid winding and fixing of the shoulder and the arm, the time for installing the positioning device is saved, the examination efficiency is improved, and the waiting time of a patient is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of image scanning, in particular to a shoulder joint image scanning auxiliary positioning device. BACKGROUND

[0002] At present, shoulder joint image scanning is a means for imaging examination of the structures of the shoulder joint such as bone, articular cartilage, tendon and ligament by means of X-ray, CT, MRI and other imaging technologies, which can clearly present the pathological changes inside the shoulder joint. In the process of shoulder joint image scanning, the joint of the patient needs to be fixed. The existing shoulder joint positioning device is complicated to install, takes a long time to install, and thus leads to low examination efficiency and long waiting time of the patient. The positioning part of the shoulder joint and the upper arm is not firm, and the angle between the shoulder joint and the upper arm cannot be accurately adjusted and fixed. SUMMARY

[0003] The present application provides a shoulder joint image scanning auxiliary positioning device. The existing shoulder joint positioning device is complicated to install, takes a long time to install, and thus leads to low examination efficiency and long waiting time of the patient. The angle between the shoulder joint and the upper arm cannot be accurately adjusted and fixed.

[0004] To solve the above-mentioned problems, the technical scheme provided by the present application is as follows:

[0005] A shoulder joint image scanning auxiliary positioning device, comprising a shoulder shell and an arm shell, the shoulder shell and the arm shell are connected through an angle locking assembly, the shoulder shell and the arm shell can rotate or be locked relative to each other, a binding belt is installed on the shoulder shell and the arm shell, a binding belt driving device is installed on the shoulder shell and the arm shell, and the binding belt driving device drives the binding belt to be folded or unfolded.

[0006] Optionally, a fixing seat is arranged on one side of the shoulder shell close to the arm shell, and a rotating seat is arranged on one side of the arm shell close to the shoulder shell.

[0007] Optionally, the angle locking assembly comprises a rotating rod, both ends of the rotating rod are installed on the fixing seat, and a rotating seat is connected to the rotating rod.

[0008] Optionally, a ratchet wheel is connected to the rotating rod, a recessed frame is arranged on the fixing seat, a locking pawl assembly is installed on the recessed frame, and the locking pawl assembly.

[0009] Optionally, the locking pawl assembly comprises an adjusting screw rod installed on the fixing seat, the lower part of the adjusting screw rod is threadedly connected with the upper part of a sliding sleeve, the lower part of the sliding sleeve is sleeved on a sliding rod, a limiting block is arranged at the bottom of the sliding rod, a limiting plate is arranged on the middle part of the sliding sleeve, a spring is sleeved on the lower part of the sliding sleeve, and one end of the spring is connected with the limiting plate and the other end of the spring is connected with the limiting block.

[0010] Optionally, the bandage driving device comprises two mounting racks mounted on the arm shell, two sections of the long winding rod are mounted on the two mounting racks respectively, one end of the bandage is connected to the arm shell and the other end is wound on the long winding rod.

[0011] The shoulder shell is provided with a mounting rack, and the mounting rack is provided with a short winding rod, one end of the bandage is connected to the shoulder shell and the other end is wound on the short winding rod.

[0012] The long winding rod and the short winding rod are connected through a universal joint structure.

[0013] Optionally, the universal joint structure comprises a linkage cylinder, one end of the long winding rod close to the shoulder shell is connected with a linkage cylinder, the linkage cylinder is provided with a linkage shaft, one end of the short winding rod close to the arm shell is connected with a linkage cylinder, the linkage cylinder is provided with a linkage shaft, and the linkage shaft of the long winding rod and the linkage shaft of the short winding rod are connected through a universal joint.

[0014] Optionally, the bandage driving device further comprises a driving assembly, the driving assembly comprises a worm gear box mounted on the arm shell, the worm gear box is provided with a worm gear and a worm rod, the worm gear is mounted on the short winding rod, the worm rod is arranged on a driving rod, and a knob is mounted on the outer end of the driving rod.

[0015] Optionally, the shoulder shell is provided with a positioning seat, and the positioning seat is provided with a balance instrument.

[0016] Optionally, the inner sides of the shoulder shell and the arm shell are provided with flexible pads.

[0017] Compared with the prior art, the above technical scheme has at least the following beneficial effects:

[0018] The angle locking assembly of the shoulder joint image scanning auxiliary positioning device can adjust and lock the angle of the shoulder shell and the arm shell, adjust the angle of the shoulder shell and the arm shell according to different inspection requirements, meet diversified scanning requirements, and improve the versatility and practicability of the device.

[0019] The bandage driving device can quickly wind and fix the shoulder and arm, compared with the traditional manual complex winding method, the time for installing and positioning the device is saved, the inspection efficiency is improved, and the waiting time of the patient is reduced.

[0020] The angle locking assembly and the worm and gear structure in the bandage driving device form a reliable limiting and fixing structure, in the scanning process, even if the patient's body has slight movement, the flexible bandage can be effectively prevented from loosening, the position stability of the positioning device is ensured, the deviation of the image scanning caused by the movement of the device is avoided, and the accuracy and reliability of the scanning result are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is one of the structure schematic views of the shoulder joint image scanning auxiliary positioning device of the present application.

[0023] Figure 2 It is the second structure schematic view of the shoulder joint image scanning auxiliary positioning device of the present application.

[0024] Figure 3 It is the bottom view of the shoulder joint image scanning auxiliary positioning device of the present application.

[0025] Figure 4 It is the structure schematic view of the bandage driving device of the shoulder joint image scanning auxiliary positioning device of the present application.

[0026] Figure 5 It is the structure schematic view of the driving assembly of the shoulder joint image scanning auxiliary positioning device of the present application.

[0027] Figure 6 It is the structure schematic view of the angle locking assembly of the shoulder joint image scanning auxiliary positioning device of the present application. Figure 1 ;

[0028] Figure 7 It is the structure schematic view of the angle locking assembly of the shoulder joint image scanning auxiliary positioning device of the present application. Figure 2 .

[0029] The following is the explanation of the reference signs in the drawings:

[0030] 1, shoulder shell; 2, fixed seat; 3, rotating seat; 4, arm shell; 5, connecting plate; 6, bandage; 7, guide cylinder; 8, short hollow cylinder; 9, long hollow cylinder; 10, short winding rod; 11, long winding rod; 12, mounting frame; 13, linkage cylinder; 14, linkage shaft; 15, universal coupling; 16, worm wheel box; 17, worm wheel; 18, drive rod; 19, worm; 20, knob; 21, rotating rod; 22, ratchet; 23, concave frame; 24, adjusting screw; 25, sliding sleeve; 26, limiting plate; 27, sliding rod; 28, limiting block; 29, spring; 30, positioning seat; 31, balance instrument; 32, flexible pad. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0032] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the common meaning understood by those of ordinary skill in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not denote any order, quantity or importance, but are used to distinguish different components. Similarly, the terms "one", "a" or "the" and similar terms do not denote quantity limitation, but mean that at least one exists. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0033] It should be noted that "up", "down", "left", "right", "front", "back" and the like used in the present application are only used to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0034] As Figures 1-2As shown, the embodiment provides a shoulder joint image scanning auxiliary positioning device, which comprises a shoulder shell 1 and an arm shell 4, the shoulder shell 1 and the arm shell 4 are connected through an angle locking assembly, the shoulder shell 1 and the arm shell 4 can rotate or be locked, a bandage 6 is installed on the shoulder shell 1 and the arm shell 4, a bandage driving device is installed on the shoulder shell 1 and the arm shell 4, and the bandage driving device drives the bandage 6 to fold or unfold. The device of the embodiment, the shoulder of the patient is inserted between the shoulder shell 1 and the bandage 6, the upper arm is inserted between the arm shell 4 and the bandage 6, the angle between the shoulder shell 1 and the arm shell 4 is adjusted and locked by using the angle locking assembly, the bandage 6 is automatically folded by the bandage driving device, the shoulder shell 1 is fixed on the shoulder of the patient, and the arm shell 4 is fixed on the upper arm of the patient.

[0035] As shown in Figure 2 , Figure 6 and Figure 7 , a fixing seat 2 is arranged on one side of the shoulder shell 1 close to the arm shell 4, and a rotating seat 3 is arranged on one side of the arm shell 4 close to the shoulder shell 1. The angle locking assembly comprises a rotating rod 21, a ratchet wheel 22, a locking pawl assembly and the like, both ends of the rotating rod 21 are installed on the fixing seat 2, and the rotating seat 3 is connected to the rotating rod 21. The rotating rod 21 is connected with the ratchet wheel 22, a concave frame 23 is arranged on the fixing seat 2, the locking pawl assembly is installed on the concave frame 23, and the locking pawl assembly comprises an adjusting screw rod 24 installed on the fixing seat 2. The lower part of the adjusting screw rod 24 is threadedly connected with the upper part of a sliding sleeve 25, the lower part of the sliding sleeve 25 is sleeved on a sliding rod 27, the bottom of the sliding rod 27 is provided with a limiting block 28, the middle part of the sliding sleeve 25 is provided with a limiting plate 26, a spring 29 is sleeved on the lower part of the sliding sleeve 25, and one end of the spring 29 is connected with the limiting plate 26 and the other end is connected with the limiting block 28. Specifically, the bottom of the limiting block 28 is provided with a protrusion, the protrusion is inserted into the tooth cavity of the ratchet wheel 22. More specifically, the two sides of the protrusion are inclined surfaces, which facilitate the protrusion to enter or exit the tooth cavity of the ratchet wheel 22, and facilitate better locking of the ratchet wheel 22.

[0036] The device of the embodiment, the adjusting screw rod 24 is twisted, the sliding sleeve 25 and the limiting block 28 move downward, the protrusion at the bottom of the limiting block 28 enters the tooth cavity of the ratchet wheel 22, the adjusting screw rod 24 is continuously twisted, the sliding sleeve 25 continuously moves downward, the baffle in the sliding sleeve 25 presses the top of the sliding rod 27 to continuously move downward, until the protrusion at the bottom of the limiting block 28 completely presses against the ratchet wheel 22, and the shoulder shell 1 and the arm shell 4 are locked; when the angle between the shoulder shell 1 and the arm shell 4 needs to be adjusted, the adjusting screw rod 24 is twisted, the sliding sleeve 25 moves upward, the limiting block 28 moves upward under the action of the spring 29, and the shoulder shell 1 and the arm shell 4 can rotate relative to each other. The angle between the shoulder shell 1 and the arm shell 4 is adjusted by the angle locking assembly, the firmness of the fixed shoulder shell 1 and the arm shell 4 is ensured, and the detection accuracy is improved.

[0037] The angle locking component in this embodiment realizes the angle adjustment and locking of the fixed shoulder housing 1 and arm housing 4. According to different inspection needs, the angle of the shoulder housing 1 and arm housing 4 can be adjusted to meet diverse scanning requirements, improve the versatility and practicality of the device, and solve the problems of inconvenient angle adjustment, difficulty in precise control, inability to meet diverse inspection needs, and poor versatility of the existing shoulder joint imaging scanning auxiliary positioning device.

[0038] like Figures 3-5 As shown, the strap driving device includes two mounting brackets 12 mounted on the arm housing 4. Two sections of a long coiled rod 11 are respectively mounted on the two mounting brackets 12. The long coiled rod 11 can rotate within the mounting brackets 12. One end of the strap 6 is connected to the arm housing 4, and the other end is wrapped around the long coiled rod 11. A mounting bracket 12 is mounted on the shoulder housing 1, and a short coiled rod 10 is mounted on the mounting bracket 12. The short coiled rod 10 can rotate within the mounting bracket 12. One end of the strap 6 is connected to the shoulder housing 1, and the other end is wrapped around the short coiled rod 10. The long coiled rod 11 and the short coiled rod 10 are connected by a universal coupling structure. In this embodiment, when the short coiled rod 10 rotates forward, the strap 6 wraps around the short coiled rod 10, the exposed length of the strap 6 decreases, and the strap 6 tightens around the patient's shoulder. When the short coiled rod 10 rotates in the reverse direction, the strap 6 wrapped around the short coiled rod 10 unwinds, the exposed length of the strap 6 increases, and the strap 6 no longer tightens around the patient's shoulder. As the short coil rod 10 rotates, it drives the long coil rod 11 to rotate through the universal coupling structure, so that the straps 6 wrap around or unwrap the long coil rod 11, realizing the synchronous movement of the short coil rod 10 and the long coil rod 11, so that the patient's shoulder and upper arm are simultaneously tightened or loosened by the straps 6.

[0039] The strap drive device enables rapid wrapping and fixation of the shoulder and arm. Compared with the traditional manual and complicated wrapping method, it saves the time of installing the positioning device, improves the examination efficiency, reduces the patient's waiting time, and solves the problem that the existing shoulder joint imaging scanning auxiliary positioning device has a cumbersome and time-consuming installation process, resulting in low examination efficiency and long patient waiting time.

[0040] Furthermore, the long winding rod 11 is covered with a long hollow cylinder 9, and the short winding rod 10 is covered with a short hollow cylinder 8, so that dust will not enter the long hollow cylinder 9 or the short hollow cylinder 8.

[0041] like Figure 4As shown, the universal joint structure of the embodiment comprises linkage cylinders 13, linkage shafts 14 and universal joints 15, the linkage cylinder 13 is connected to one end of the long winding rod 11 close to the shoulder shell 1, the linkage shaft 14 is installed on the linkage cylinder 13, the linkage cylinder 13 is connected to one end of the short winding rod 10 close to the arm shell 4, the linkage shaft 14 is installed on the linkage cylinder 13, and the linkage shaft 14 of the long winding rod 11 is connected with the linkage shaft 14 of the short winding rod 10 through the universal joint 15. Specifically, the linkage cylinder 13 is provided with two, one is connected to the long winding rod 11 and the other is connected to the short winding rod 10, at least one linkage shaft 14 is arranged on each linkage cylinder 13, and the linkage shafts 14 on the two linkage cylinders 13 are connected through the universal joint 15, and the transmission route is short winding rod 10, linkage cylinder 13, linkage shaft 14, universal joint 15, linkage shaft 14, linkage cylinder 13, long winding rod 11.

[0042] As shown in the figure, Figure 5 As shown, the strap driving device of the embodiment further comprises a driving assembly, the driving assembly comprises a worm wheel box 16 installed on the arm shell 4, a worm wheel 17 and a worm 19 are installed in the worm wheel box 16, the worm wheel 17 is installed on the short winding rod 10, the worm 19 is arranged on the driving rod 18, and the knob 20 is installed on the outer end of the driving rod 18. Specifically, one end of the short winding rod 10 is installed on the mounting bracket 12 and the other end is installed on the worm wheel box 16, so that the positioning of the short winding rod 10 is realized. More specifically, the two ends of the short winding rod 10 are respectively installed on the mounting bracket 12 and the worm wheel box 16 through bearings, and the two ends of the long winding rod 11 are respectively installed on the mounting bracket 12 through bearings; the middle part of the driving rod 18 is the worm 19, and the two end parts are light rods, the two ends of the driving rod 18 are installed on the worm wheel box 16 through bearings, and the outer end of the driving rod 18 extends outward from the worm wheel box 16. The operator twists the knob 20, the driving rod 18 rotates, the worm 19 cooperates with the worm wheel 17, the worm wheel 17 rotates, and the rotation of the worm wheel 17 drives the rotation of the short winding rod 10, and the rotation route is driving rod 18, worm 19, worm wheel 17, short winding rod 10; by twisting the knob 20, the rotation in two directions of the driving can be realized, and then the rotation in two directions of the short winding rod 10 and the long winding rod 11 is realized, so that the strap 6 winds or unwinds the short winding rod 10 and the long winding rod 11. The driving assembly of the embodiment utilizes the worm and gear structure, realizes the reverse self-locking function, that is, after the strap 6 is tightened on the shoulder or the large arm, no matter how the patient shakes the shoulder or the large arm, the strap 6 will not loosen, preventing loosening during the scanning process, and ensuring the stability of the device position.

[0043] As shown in the figure, Figure 1As shown, the shoulder shell body 1 is provided with a positioning seat 30, and the positioning seat 30 is provided with a balance instrument 31. The balance instrument 31 monitors the horizontal state and balance of the device in real time. When the patient's posture changes, the device is tilted or unevenly stressed, the balance instrument 31 feeds back the detected signal to the operator. The operator can adjust the tightness of the binding belt 6, and fine-tune the angle between the shoulder shell body 1 and the arm shell body 4, so as to ensure that the device is in a balanced and stable state, and ensure that the scanning process is stable, and provide a reliable balance reference for medical staff, and assist them to complete the positioning operation more efficiently and accurately.

[0044] As shown in the drawings, Figure 3 As shown, the inner sides of the shoulder shell body 1 and the arm shell body 4 are provided with flexible pads 32. The flexible pads 32 significantly improve the comfort of the patient during use. During the shoulder joint image scanning process, the patient needs to maintain a specific posture. The soft material of the flexible pad 32 can effectively relieve the compression of the part of the device in contact with the patient's body, and avoid skin discomfort or pressure marks caused by long-term examination. The shoulder shell body 1 and the arm shell body 4 are both provided with uniformly distributed connecting plates 5. One end of the binding belt 6 is connected to the connecting plate 5, and the other end of the binding belt 6 is wound around the short winding rod 10 and the long winding rod 11. The binding belt 6 is more evenly stressed during winding, avoiding excessive local pressure and improving the comfort of the patient wearing. Specifically, one side of the shoulder shell body 1 and the arm shell body 4 is provided with a connecting plate 5, and the other side is provided with a guide cylinder 7. The binding belt 6 passes through the guide cylinder 7 and is wound around the short winding rod 10 and the long winding rod 11. The guide cylinder 7 provides accurate guidance for the winding and unwinding of the binding belt 6, avoiding problems such as knotting and direction deviation during unwinding and winding.

[0045] The angle locking assembly of the present application and the worm and gear structure in the binding belt driving device form a reliable limiting and fixing structure. Even if the patient's body moves slightly during the scanning process, the flexible binding belt 6 can be effectively prevented from loosening, the position of the positioning device can be stabilized, the deviation of the image scanning caused by the movement of the device can be avoided, the accuracy and reliability of the scanning result can be improved, and the problem that the positioning device is not fixed firmly in the prior art and is easily affected by the slight movement of the patient's body to cause displacement, thereby causing the image scanning deviation and affecting the accuracy of the diagnosis result.

[0046] The working process of the shoulder joint image scanning auxiliary positioning device of the present application is as follows:

[0047] The shoulder shell body 1 and the arm shell body 4 are sleeved on the patient's shoulder and upper arm, and the angle between the shoulder shell body 1 and the arm shell body 4 is adjusted. The reverse adjusting screw 24 is used to lock the position between the shoulder shell body 1 and the arm shell body 4 by means of the ratchet 22 and the limiting block 28.

[0048] Screwing the knob 20 forward, the short winding rod 10 is driven to rotate forward by the worm 19 and the worm gear 17, and then the long winding rod 11 is driven to rotate forward, the bandage 6 is wound on the short winding rod 10 and the long winding rod 11, the bandage 6 limits the shoulder and the upper arm of the patient in the shoulder shell 1 and the arm shell 4, and image scanning is performed;

[0049] After the image scanning is completed, the knob 20 is screwed reversely, the short winding rod 10 and the long winding rod 11 are reversely rotated, the bandage 6 is loosened from the short winding rod 10 and the long winding rod 11; the adjusting screw 24 is screwed forward, the limiting block 28 no longer locks the ratchet 22, and the shoulder shell 1 and the arm shell 4 can be freely adjusted in angle, and the shoulder shell 1 and the arm shell 4 are removed from the shoulder and the upper arm of the patient.

[0050] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A shoulder joint image scan assisted positioning device, characterized in that, The shoulder shell and the arm shell are connected by an angle locking assembly, the shoulder shell and the arm shell can rotate or lock, the shoulder shell and the arm shell are provided with a bandage, the shoulder shell and the arm shell are provided with a bandage driving device, and the bandage driving device drives the bandage to be wound or unfolded.

2. The auxiliary positioning device for shoulder joint image scanning according to claim 1, wherein a fixing seat is arranged on the shoulder shell near the arm shell, and a rotating seat is arranged on the arm shell near the shoulder shell.

3. The auxiliary positioning device for shoulder joint image scanning according to claim 2, wherein the angle locking assembly comprises a rotating rod, both ends of the rotating rod are installed on the fixing seat, and the rotating seat is connected to the rotating rod.

4. The auxiliary positioning device for shoulder joint image scanning according to claim 3, wherein the rotating rod is connected with a ratchet wheel, a concave frame is arranged on the fixing seat, a locking pawl assembly is installed on the concave frame, and the locking pawl assembly is arranged on the concave frame.

5. The auxiliary positioning device for shoulder joint image scanning according to claim 4, wherein the locking pawl assembly comprises an adjusting screw rod installed on the fixing seat, the lower part of the adjusting screw rod is threadedly connected with the upper part of a sliding sleeve, the lower part of the sliding sleeve is sleeved on a sliding rod, the bottom of the sliding rod is provided with a limiting block, the middle part of the sliding sleeve is provided with a limiting plate, a spring is sleeved on the lower part of the sliding sleeve, and one end of the spring is connected with the limiting plate and the other end is connected with the limiting block.

6. The auxiliary positioning device for shoulder joint image scanning according to claim 1, wherein the bandage driving device comprises two mounting frames installed on the arm shell, two sections of a long winding rod are installed on the two mounting frames respectively, one end of the bandage is connected with the arm shell and the other end is wound on the long winding rod. A mounting frame is installed on the shoulder shell, a short winding rod is installed on the mounting frame, one end of the bandage is connected with the shoulder shell and the other end is wound on the short winding rod. The long winding rod and the short winding rod are connected through a universal joint structure.

7. The auxiliary positioning device for shoulder joint image scanning according to claim 6, wherein the universal joint structure comprises a linkage cylinder, one end of the long winding rod near the shoulder shell is connected with the linkage cylinder, the linkage cylinder is installed with a linkage shaft, one end of the short winding rod near the arm shell is connected with the linkage cylinder, the linkage cylinder is installed with a linkage shaft, and the linkage shaft of the long winding rod and the linkage shaft of the short winding rod are connected through a universal joint.

8. The auxiliary positioning device for shoulder joint image scanning according to claim 6, wherein the bandage driving device further comprises a driving assembly, the driving assembly comprises a worm gear box installed on the arm shell, a worm gear and a worm are installed in the worm gear box, the worm gear is installed on the short winding rod, the worm is arranged on a driving rod, and a knob is installed on the outer end of the driving rod.

9. The shoulder joint imaging scan assisted positioning device as claimed in claim 1, wherein said shoulder housing is provided with a positioning seat, said positioning seat is provided with a balancing instrument.

10. The shoulder joint imaging scan assisted positioning device as claimed in claim 1, wherein said shoulder housing and inner side of said arm housing are provided with flexible pads.

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